The art feels very unique, I really like that.
The gameplay is simple, but it does not offer much after the first few seconds. It could be improved by adding different weapons or maybe close combat options etc.
The character sprite disappears after jumping. I guess this is either a feature for invincibility or a sprite bug. If it is a feature, I do not like it because I cannot clearly see my character’s position during that time. That is why it might be better to present it in a different way.