I really liked the artwork of the character, as well as the horizontal scrolling shooter vibe. R-Type is fun to play, and I think you're trying to channel this, which is awesome.
If I were to give some suggestions, I'd look at changing the shape of the other moving objects. Relative to the size of the player, they're quite small! I wasn't sure if they were bullets or enemies. I bet adjusting those would help with tuning other things if you decide to as well.
Keep up the good work!