About weapons to use: 1) lightning is the best weap in my opinion, always use 2) 4 homings helps a lot until lvls 45-50 / big laser for final levels 3) energy homers (basic weapon, fast reload and nice dmg). I used slow time with energy homers/4 homings in the last 5 lvls, because a lot of enemies came. DON'T use squarestep, BFG and vortex. Duck death (the final weap) i found useless.