Nice art style! Feels like a game drawn in a notebook :)
I enjoyed how easy the gameplay was and how it gets trickier with time. I think it would be interesting to have some additional features, like powerups or bosses :) And music, of course! Also you say in the description that player has to "survive the alien threat in a messy, glitch-filled world!", but I am not sure that I understood what glitches you mean exactly...Would be cool to have some great glitches and bugs, that mess with you playing :)