Man, I just don't have the platforming chops anymore. Can't do the side path up the rockets at Sexton Villa.
So the game is really cool, ducko! Sorry I haven't played very far - I'm dealing with some renos and insurance nonsense that is taking up a lot of my time. But I like what I've played so far. It immediately reminded me of Cave Story which is a very good thing. I like the dashing mechanic a lot. It felt good to discover I could go through walls and find a secret GER* that way, before the game actually explains the mechanic.
*Yes the 3x3 pixel font is a little hard to read.
The running to get more jump height thing confused me as well. Figured it out just after the froggo, which was the first jump to require it. I was curious why when I jumped against the wall, I seemed to gain less height. Practiced it and realized I only needed a very short runway to get more height.
At first the camera shifting when turning left and right made me a little dizzy. I got used to it before too long though. I think it's required to see further in front of you due to how quickly some enemies can move.
Regarding inputs, I kind of felt X should be used for accept, and Z for back. At least that feels most normal to me. When I got the second gun I tried using number keys to swap between them like hint said, but that didn't seem to work.
Is there any way to go fullscreen? Or even a 2x/3x mode would be cool.
You can kind of get stuck in these little holes. With enough jump spamming you can escape though.
I feel like the mechanics you've implemented really lend themselves well to finding secrets, so it should be a lot of fun to explore levels.
Also the music is jammin'. Had to turn down my sfx a little bit just so I could turn up the music.