Added summer as a map!

I have updated the game! Now you can play on Summer, the 2nd of 4 maps. There are also new enemies, mechanics and bosses!
Have fun! :)

General updates:

• Added 2nd map
• Updated Music (and credits)
• Added 5 new bosses
• Added 2 new mobs
• Added a trader to the new map

As always if you encounter a bug please let me know so i can fix it in the future.
Feedback is much appreciated, as i am trying game design out as a hobby and want to improve my skills