Chivione version 0.2.3a

Changes:

• Updated enemy AI, much better now
• Enemies now collide with the walls
• Added a test section for new features (this is mainly for me, but I've released it like that so that you can give feedback on some things in) developement
• New larger enemy with a jump attack

Notes:

• There is still some bug testing stuff on screen
• Enemy sprites are only placeholders