I am making the GameJolt Competition, and I’ll use C++/SDL to make my game. I’m trying to make a side scrolling space game with the Theme Shocking. I’m still learning how to manage the game states, so if you guys have tutorials about it, let me know, PM me 
I still have 4 days left, until the deadline. So I’ve got plenty of time to plan at least 3 levels. I already have the monsters and space ships, which I downloaded from Open Game Art. I’ll add sound with sfxr, which is an application from Dr.Peter and FMOD library. So wish me luck. I’ll post updates.