It has potential but:
- If you fall over the map nothing happens;
- High scoore doesn't have sense because if you survive then you will have around 2200;
- after the game ends you can still play it for some reason;
- shooting could be done better (shoot in direction of mouse not by using A or D; add keyboard button for shooting);
- Space for jump would be useful;
- right and left arrow doesn't make sense because you need to use mouse;
but still the graphics and particles is very good, also the music is catchy. With some work it could be a very good game :D