just ran through the game few times and noticed some bugs that shouldn't be to hard to fix. when collecting the golden floppy disks while in the child level the game sometimes freezes (you can still open the menu just the character model gets stuck in place) but I haven't noticed this happening when in adult level. while playing as Ikkakumon the slop before shellmon is, i've noticed he gets stuck and there isn't way to get him unstuck which is annoying but not a major issue.
overall I really enjoyed the game, I'm really looking forward to being able to play more levels in the future and see what else comes