×MyScript Primer and Reference!

My First Hold, also the first published!
Persistence, a mini-hold about returning to rooms.
The Spacetime Kerfluffle, a mini-hold I made once.
Variations, a collab hold I'm managing.
Beethro's Awakening Preview, Zelda and DROD?!

Alphabet Stream info, about my stream thing I do sometimes.

×
Entrance: Broken?
1S: Probably the easiest room (aside from entrance) but still ok.
2S: Challenge! Don't use the mirrors. I honestly have no idea how to do it the intended way.
2S1E: this felt weird, is my solution intended?
1N: easiest "tarstuff" related room. Broke it?
1S1w: also ok room, managed to use an extra roach but not an interesting challenge.

2S2W: no idea how to do it. Probably by blocking some wubbas in the 1 tile obstacle or behind the doors?
1N1E: probably the room I am most curious about, spent 30 minutes doing dozen of different things but no one seemed to work.
I tried all of the other rooms, but I either came close to complete them (1N2W), or got stucked completely (time token rooms)

×
In my experience, there is no such thing as "too many checkpoints". Of course, filling the room with them is pointless and bad looking, but here's what I do. I place A LOT of checkpoints when building the room in the spots where I think the solution requires you to go. Then I test the room, and I found that some checkpoints are ok, some are useless, and sometimes others are needed. Basically, it is better, IMO, to put a lot of checkpoints and removing them after the room is complete and during testing.
For example, in this hold some checkpoints are located within the bomb blast radius, that felt weird.
In parity and flow you put checkpoints where you think the main locations are, but this does not mean that "secondary" locations are not important. I'll try to give more specific comments for that hold in the next days hopefully.

×The Entrance is a dumb cutscene room just to start the hold with, and it's the only one that blocks any other rooms, so it's kind of intentionally broken to make absolutely sure players can access the rest of the hold. I may have originally intended you to need both other roaches to reach the one at (20, 13), but I'm fine with it the way it is now.

1S is a "proper" introduction to how the rest of the level's rooms will work; it's guaranteed to be the first one players encounter, so I want players to see the "template" before going off and seeing the rest of the rooms. Again, I'm fine with that making it pretty easy.

2S you did break; the player's not supposed to get access to any of the powder kegs before they explode. It's a pretty dumb oversight now that I see it, and I'm pretty sure my update will fix it, too. The intended solution has Halph open the arrows for you as you progress through the hallway to the eye, and the mirrors are supposed to help with that without being enough to put something on all 5 buttons at once.

You've got the right solution to 1N, as far as I'm concerned. Having a few babies out in the open when stepping into the hallway is a bit more efficient than my solution, which insists on only using the 5 on the buttons + a couple that appear when the mudblob is blown up. The key trick to that room (which is important in few other rooms too!) is "lengthening the fuse" using the kegs to have enough time to reach the brain.

1N1E is the "hardest" of the three tarstuff rooms, and you may get a better idea of how to solve it by solving 1E.

Keeping a 6th roach alive in 1S1W isn't too impressive, and just seems like what optimizers will do anyway; my solution does that too.

I'm pretty sure the idea in 2S2W is that you need some wubbas to be stuck directly on top of the closed doors, as well as a few being "behind" each door. This means you have to close the doors in "the right order" and be very careful about how you move from one door to the next on your way through the room. Maybe I should just make it so the giant outer door doesn't open when the eye is killed?

2S1E is definitely one of the easier rooms in the level. I think my "intent" was to wake the eye only after putting roaches on all 5 buttons, but there's no reason that's truly necessary. Your solution looks fine to me.

Of the timeclone rooms, 2W should be the easier one; mostly just a bit of an "efficiency rush".

...and finally, the bombs exploding is usually the first thing that happens in each room, so I don't see any issue with checkpoints being in their range. I had the thought of including checkpoints at "corners" like that as part of the "room template", and just didn't fully commit to that in rooms where I thought I had better ideas of where they should go.
The only other thing I'll say for now is that I'm reluctant to think of checkpoint placement in terms of where the intended solution goes since I sort of don't want them to "give away" any information about said solution, but I guess red herrings aren't all that hard to add in.

×MyScript Primer and Reference!

My First Hold, also the first published!
Persistence, a mini-hold about returning to rooms.
The Spacetime Kerfluffle, a mini-hold I made once.
Variations, a collab hold I'm managing.
Beethro's Awakening Preview, Zelda and DROD?!

Alphabet Stream info, about my stream thing I do sometimes.

×The button in the NW is a useful place to store something while you work.

×MyScript Primer and Reference!

My First Hold, also the first published!
Persistence, a mini-hold about returning to rooms.
The Spacetime Kerfluffle, a mini-hold I made once.
Variations, a collab hold I'm managing.
Beethro's Awakening Preview, Zelda and DROD?!

Alphabet Stream info, about my stream thing I do sometimes.

×MyScript Primer and Reference!

My First Hold, also the first published!
Persistence, a mini-hold about returning to rooms.
The Spacetime Kerfluffle, a mini-hold I made once.
Variations, a collab hold I'm managing.
Beethro's Awakening Preview, Zelda and DROD?!

Alphabet Stream info, about my stream thing I do sometimes.