This is what I originally made my game engine for, it was going to be a clone of DinoCap, a silly IOS game I have enjoyed from time to time in my spare time. I was really enjoying it, but unfortunately the person who was supposed to do the textures for the game couldn't deliver and I suck at graphics so I called it quits for that project. But I already had the base systems for a side scrolling shooter in place and I didn't want my time to be a complete waste so I re-developed the game (After some time trying to find free textures online, that could do the job) using textures online as a side scrolling game with a moba style combat system.

The textures I could find online were few and far between and even the ones I did find needed editing to make them usable, this severely limited my options and really opened my eyes to just how important a graphic designer is. Sure I could have drawn some stick men with some stick guns, but I have no desire to make a game that looks like arse, I couldn't bring myself to do that. And so I went on with the few textures I had, limiting my attacks to two and my enemies to few, some don't even have attack animations. But I still love those people that did put their hard work online for me to use because I couldn't have done it without them.

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The game's feature list is:

Game sessions (Can pause the game and continue from where you were at or start a new game)
Rebindable keys
Sound effect and music volume sliders as well as buttons to enable or disable both of them
Graphic settings which have low and high options (Smoothing mode and interpolating mode)
Credits menu which supports custom speed and pausing
Side scrolling world which you can travel through infinitely
Four different types of enemies (Two with attack animations) + 1 hidden 0.1 spawn chance enemy. Each have different damage, speed, health, etc and must be fought in a different way. You can't always run away!
Score system with different death messages based upon your score
Difficulty scaling based upon the amount of kills you have. Will scale enemy damage, health, speed and spawn time.
Distance traveled tracking
Player animations for everything including two attacks, death and movement
Two different attacks for the player to use, one which is AOE and the other direct. Both have cooldown timers in the top in the form of a box which ticks down like a clock until you can attack again