wow this is so fun to play

Is the level with the question mark block and purple dot even able to be completed? The spears fall to fast from above to outrun. You can't jump them and you can't fake them out...

Good music used, simple character and background design, easy controls, and straightforward gameplay. But the score shouldn't keep increasing even when you die by killing enemies. It could also use some more levels.

Good. A simple platformer, but the movement feels fluent and the controls are very responsive, so it's fun. The final level felt perhaps a bit too harsh and took really a lot of retries to complete.

The problem is that your score is kept even if you die, so the easiest way to get the max score is to die a couple of times and kill enemies again and again.
You should probably save the score at the beginning of a level, and reset to the value if you die.

Also, have you considered adding medals/scoreboards to your games?
https://www.newgrounds.io/
I think it would attract more players and add some more replay value.