Yeah it's not exactly clear! If you let the demo screen play for a while it will show you what some of the power ups do, but there's way more.
When you go into caves beneath the rocks just shoot all the white boxes and get out quick before the flood of leech things come. Make sure to use any power ups before the next cave.
I think to get the options you have to grab the invincibility power up and walk into the blue dudes that disappear on and off.
Going in the water drains your health, and as said above, the big leech things that come out of the water can steal your upgrades which can be a game ender.
If you touch off the bosses they drain your energy in seconds. Once they get close to the bottom of the screen, move up and as far away from them as possible. They'll jump up, you move down and repeat.
I'm only doing it one credit at a go and have gotten as far as the 3rd boss which is bananas difficulty. I'm sure there's some strategy to it though
Soooo, I just watched some guy playing it on YouTube and all you have to do to get the options is walk into the blue guys. Man, that we will make it a lot easier! mysticmonk2020-05-17 23:50:57