Hi, thanks for trying out the demo, you have to switch your ammo by pressing select to switch to a missile, then your default bullet will change. Sliding is done by holding down while walking, continually holding down will turn morph ball on, so u need to let go of walking and do the sequence again to slide again. GB Studio [the engine I'm using] doesn't have a very complex button config features as of 2b5, maybe in the 3.0 update it will be better.