0.5.1 - Some bug fixes

Thank you all for your feedback on the game’s issues. This update includes the following bug fixes:

1. The number of coins in the inventory now displays correctly.
2. Added extra collision checks for coins, greatly reducing the chance of them getting stuck in walls; coins that do get stuck are now automatically counted as collected.
3. Enemies are now recorded as defeated when they are actually defeated, rather than when they move off-screen.
4. Fixed the quantity of coins dropped.
5. (Still testing) Added additional collision detection for destructible obstacles (the issue of obstacles disappearing upon collision is hard to reproduce; a complete solution is still under investigation).
6. (Still testing) Adjusted the web export settings; it should now reduce performance overhead on macOS.