rewards:
- do undoable action: -1
- lose hp: -5
- die: -100
- kill: +20
- attack: +5
- collect ressouces: +5
- destroy wall : +10


action vector:
0: go left
1: go right
2: go up
3: go down
4: attack
5: collect
6: purchase
7: upgrade 
8: drink potion