Got a big ole writeup for you.
-The framerate keeps tanking like crazy on my 11 year old rig. Take of that what you will.
-Autoclimbing up the small steps in the tutorial took a bit to figure out what was happening. I tried to jump over them and I was flung in the opposite direction and off the cliff.
-As a fan of emulator type controls (zxc + arrow keys), I found the default control mappings miserable. Especially ctrl to read signs.
-Oh geez, walljumping is awkward. Please look into increasing the force to 150%~200% of what it currently is, please.
-It keeps mentioning throw like it's an ability you should have but I can't find it.
-As I struggled with in my own game, the worst part of these character switching games is when you have to move characters one by one down the same path. Having a join up mechanic would work great for that, as that sort of thing happens a lot in these games.
-I REALLY don't like autoclimbing up 1 tile high gaps and going flying off when my instinct is to jump it.
-The bees section was simply too hard for me to get through with the lag and the iffy walljump mechanics. Where most games would have 4 or 5 walljumps to get up to a goal, you have 15 with how weak your walljumps are. It doesn't feel good. The bees section is simply too tight to get through or time anything with how tight the walljumps are.
-The spider doesn't seem to have walljumping at all, which feels kinda bad. The sections where you're expected to psuedo-walljump are super tight due to this.
-Speaking of the spider, it feels really awkward that controls switch constantly. I see where you're going, but I'd prefer to just hold right to move up the wall still. I'm used to that from Sonic.
-And speaking of controls, the human doesn't feel particularly great in any fashion. The only pro he has going from his is a really good ledge grab. REALLY GOOD. He could probably use a bit of rebalancing...
-I made it through the bees finally.
-The spider spike jumping section has poor conveyance. It looks like you're supposed to jump on the bottom of the spike wall and grab on but that doesn't happen. I had to pass over that spike instead.
-Crouch jumping is a stupid mechanic and I love it.
Overall, this game might be nice. Needs a lot of work on the core, however. Keep up the good work!