Nice simple mechanic.
Many of the levels seemed redundant to me. (Just the same thing as a previous level, there's no new element and the player doesn't need to understand anything new to complete, just do something they already did)
Sorry did not had so much time for creating levels
No need to be sorry :) , it's part of jamming!
Remember that only the actual dev time counts for the 3h, you can think about the game outside of that ;)
In my opinion, a very small number of focused levels work better than a large meandering assortment.
