There's a kinda gamebreaking glitch.
Here's a way to get crystals like crazy: Press R to restart, when the loading screen comes up hold Down until the game starts. You'll get teleported to level 2 and get the bonus-time crystals.
Instead of moving the character whenever a key is pressed (the key pressed event is thrown), get some booleans for up/down/left/right. On key press event the boolean for the key is switched to true, on key release it's switched to off -> smooth movement of the character. ;)
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