well these are my ideas for later versions:
1-rope
2-mini map
3-an island-forest
4-glass
5-high-range air-to-air missiles
6-controllable missile
7-customizable pumps (explosion power)
8-weapons with exploding ammunition
9-customizable music (to be able to add your own music)
10-things to be able to recharge fuel (refuel)

11 (optional) -translation to Spanish