I've updated the game. 

Enhancements/Improvements/Fixes:
- If you stop moving for more than 6 seconds, a boss will spawn. To combat those who would sit in a corner..... so 99% of users :'D 
- Can now only have up to 5 lives... i think? Not sure my changes have worked but.......
- Enemies shouldn't get stuck to the walls anymore.
- Pause menu UI was a bit messy, ive aligned the text and buttons correctly now. 

Future improvements:

- New game mode

- New enemies

- Choice of map, enemy spawn rates and player model?