Thanks for the feedback! I didn't have much time to work on a tutorial, I planned to give the weapons as the player was progressing through the waves. But the difference is that the first ice ammo slows down enemies, the second fire ammo shoots faster, the third moves slower but has a greater colision space and deals double damage (it takes 4 shots from the other ammo to take down the skully and only 2 from the third one). I had planned more enemies and power ups but I couldn't get them into this first release, sadly