1000 Amps is quite similar to DROD in some ways. The map is separated into distinct rooms, which will reset if you leave them without 'finishing'. Finishing, in this case, involves finding and lighting up all the key blocks in the room. What starts out as simple exploration in the dark gets increasingly complicated with conveyor belts, teleportation, moving blocks... For a better review, read
this.
Having played through the whole thing, I can definitely recommend it; it's polished and addictive. The only down-side is that the controls can get quite finicky, not helped by the Flash player chugging along (there's a resource bug there somewhere).