I liked the game! Only played single-player. Really good to play something casual and with a variety of ideas. I really liked the robotic voicing and dialogue of the characters. It reminded me of Cyber8's videos on youtube. I think you could get a lot of inspiration from those. Not sure what you're going to go for with the graphics, but they need changing in some way. I'd recommend either a cartoon shader or maybe some weirder "cursed graphics" might be kind of cool.
Best parts:
The key hole lady was very funny. The slide was the right level of challenge, after I figured out you need to use the camera to change direction. The acid lake platforming was good. I liked how you needed to bash keys to pick them up. I liked that dying was only a small setback.
Not-so-best parts:
Sometimes when you try to jump off a platform, you end up helicoptering. Probably because you technically falling off the platform, but it looks like you should still be considered grounded. I think helicoptering after jumping should still keep the vertical upwards momentum from the jump if you are not at the apex, because it's hard to time. The jump from the spinny disc to the next platform is very hard. The dragon fight felt very awkward, probably needs completely redoing. There was no way to check the gamepad controls ingame.
Overall, keep it up! I look forward to seeing progress.