that was colorful. it was fun for a few minutes. I wish there was more stuff in it like a power up or something like that. I think a pause button would make this better imo.
You should add something to keep the player more happy, e.g. a shop where you can buy some weapons for defence, some sort of power-ups, a small amount of health (3-4) which you can also buy in the shop, maybe even some obstacles that block your way. i'd give it at least a 4/5 then, but now its 3/5.