This could be a pretty good game except there are some issues that should be fixed.
1. The arrow key controls have some problems, for example: if I'm holding left then press the right button for a second then let go while continuing to hold left the whole time, I stop moving. Even though the left key is held, I don't move.
2. The collisions with the walls seem to have some bugs. If I hit a wall while moving diagonally, then try to move parallel to it, I move at about half speed. This continues even if I move off of the wall.
3. When the level first starts and it's fading in from blackness, I'm immune to the dots. I can ram into them and they bounce away but don't kill me.
4. I'm not sure if this was intentional, but whenever I run into a convex corner I bounce off at a strange angle.
5. This isn't really a problem, but some sound or music would go a long way.
If you fix some bugs and add some sound, then this game could be really fun!
This is a nice game! It gets pretty hard at the end, but that's fine. As spacedock said, I also noticed that I can't pick up coins that I can't pick up coins at all while moving diagonally.
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Cheers dude :) I'm scratching my head over this diagonal coin issue but as soon as I find a fix I'll upload a new version.