I haven't played much of it yet. I tried the web version, and on my system at least movement is very jerky - but maybe that's juts a web version problem, I see a lot of developers saying "web version doesn't work right" for some reason for their games. The style has a bit of a retro look that I do kind of like, and it could have potential.
But I think the one comment I have is the comment I seem to put on *every* platform game on itch : please don't use the mouse just to get a fire button. The mouse isn't just a button - the mouse is used for positional things (like aiming). If a weapon, or whatever, doesn't use the positional aspects of a mouse not only does it break a user's mental model of using a mouse, but it also makes it less usable on some laptops (mine for example disables the touchpad for a brief time after keyboard input to prevent accidentally moving the cursor when typing).
3D games use WASD/Space/Mouse because they need controls that allow movement in at least 4-5 degrees of freedom. Games that require precision shooting would of course need to use the mouse for aiming. But using the mouse for a 2D platform game with a forward-only weapon makes the game accessible to fewer devices.