The lack of checkpoints makes this game frustrating (if they're a secret you learn later it's too late)
Yeah, there's a code with the bunnies. It's harder to find than just beating the game, though, and it's not a super useful checkpoint because you still gotta go to the double jump bunny to use the code after respawning (Also I keep forgetting it and having to try a couple of variations when I respawn :'D). I think the game is small enough and has enough knowledge checkpoints to be fine without proper checkpoints, though (plus those would make me want a savefile and this game shouldn't have that).