Thanks! Unfortunately it's a university game due on monday alongside 2 other programs that I still need to finish the documentation of- but I would love to re approach the game later. For now though, it has to be finished! I would've loved to double the six be a nice even 6 chapters (like the name)- but alas! Pretty much spent every day since about mid Nov working on this one with a few exception for xmas etc so looking forward to the rest. Totally get the bosses thing too but wanted it to be at least accomplishable by lesser-skill gamers (testing had quite a few unable to get past even the first guy! hence the addition of invincibility too). A full release would include difficulty- in face some basic framework for that exists but only really effects enemy speed, bullet speed and damage, and I felt that was just superficial so cut it. Glad you ejoyed!