This game made me realize how much fun old school platformers were on the Gameboy. While knowing this game was part of the gbjam, it still brings in all the nostalgia to another level as the artwork, the level design, and the game loop just scream this came out in the wrong era. Even with the fact that it has the "use this character until you get another unique, niche character that is required", the devs really hit the nail on the head with this game
As far as glitches go, I only faced two that arguably are really huge oversights:
1. The character chosen glitch: This glitch is when you're playing as one character but the game thinks you're another character; an example being I was playing as the Bugmeister, changed screens and the game thought I was the night. Even following the advice of others on this page, this glitch broke my game as it would only allow me to do basic jumps and no attacks, regardless of who I switched to
2. The villager count/final boss oversight: I'm not sure how this game was programmed, but the game lets you get the end screen without defeating the final boss as long as you have 10 villagers. Not too big of a deal for those who cleared the castle, before returning to town, but I ended up "beating" the game before defeating Dracula. On top of that, there is (***SPOILERS***) a secret 11th villager you can find after defeating Dracula. The issue is that if you do get the 11th villager, the game will no longer allow you to get the ending (***END SPOILERS***)
All in all, the nostalgia was real with this game. It wasn't too difficult, it has it's nice quirks with the different characters and their abilities, and it's wholly reminiscent of old school Gameboy games
My playthrough: