Overall, I'm rather impressed with the first level. There are some problems, as Tim has pointed out, but it's also a great improvement from Pitiful.
There are many interesting rooms with oremites, Once West being the easiest (and probably one that should be recommended to be done first)
There are also several rooms with hot tiles and bridges that I liked. At first I did not like the way that Twice West was looking, but then I spotted the trick
Quarce North Thrice West is both secret and required. If you want this room to be a secret room, then uncheck the required box - that means that you need to finish the room in order to drop the blue door.
Twice North Once East is a pretty tedious room - perhaps some sort of trick involving keeping the wubba alive or manipulating it into a tricky-to-access snake chamber may be in order. Since it's a required room, I'd suggest using crumbly walls instead of secret walls so the player can find the room.
Some rooms are unnecessarily long - Thrice West was very simple after the orb was struck, as the aumtlich never moved and the queen spawn was very regular. The briar took a really long time to kill everything. Perhaps speeding it up by walling off some of the areas might be a good idea.
I'm not sure what Once North Thrice East is about - I was able to mop up the tar and babies really easily despite the hot tiles, and then I just had to wait a long time for the tar mother to get blown up.
I'm not sure what your intended solution is for Twice North Thrice West - I just dropped one of the trapdoors on the bridge and lured the serpent onto the bridge, killing it.
Anyway, this is a good first effort, and if the remaining levels are of this quality or better, I think it'll be a great hold. I like your style and look forward to seeing more puzzles.
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