Nice entry!
The character looks great, nice touch with the bandanna animation.
The movement controls feel pretty good but as other people have mentioned, it's bit strange to shoot with down. Perhaps, as your left hand is way over at 'Z', 'X' would be a better key for shoot. I really enjoyed spamming the key to shoot, but that would get tiring if the game was any longer (assuming reaching the top was the end).
Enemies seemed to hang around in really tight clumps, so often I could jump over a whole group at once. I guess this is only really a problem if the goal is to reach the top, rather than kill all the enemies.