I had first trouble getting past few checkpoints, but managed to finish after few tries. The fact the character ages just after small amount of time makes it hard. If it were just you who can change the age then it would be easier. But I guess it wouldn't be challenging then. It would be nice if the sprite changed somewhat when the aging happens. different ages could have different skills to move forward, now there is just walls to block you.
Anyway it's fun and music and art is nicely put together. Though not sure what's up with the background in main menu.(OK that is Firefox just bugging out, works fine on chromium browser like Edge. I have similar issue with browsers...)