Great feedback. There should be checkpoints after you clear the rooms, but I guess they aren't working for some reason. Must've messed something up in my frantic last-minute bug-fixing. Unfortunately I didn't have time to fix the soft lock issue. I mentioned it in the description, but I totally understand if you didn't catch that in the wall of text. I agree that the rebound traps should be more durable.
Anyway, thanks for playing and taking the time to leave some feedback. It means a lot :)
Edit: I looked into it, and I did, in fact, accidentally change a line of code last minute that disabled the checkpoints. Thanks for pointing that out. I added a little warning on the page to let people know.