I really enjoyed the game and was a nice challenge. Only thing I'd probably change is making it where if you failed it restarted the level rather than make you do the previous level as well.
Viewing post in Nothing Door - Jam Version jam comments
Thank you so much! Although we thought it was the way to go, enough feedback has come through to make us make some minor changes. We don't want you to 'accidentally' pass, but also don't want you to get frustrated. So, certain levels that are 'tutorial' are staying the same, but the more difficult ones 'repeat' now.
Thanks again for playing it means a lot to us.
Adam