I use gamemaker studio and roblox studio. If you don't play roblox or aren't interested in doing a multiplayer game I'd suggest starting on game maker. It's good for beginners but powerful enough to make professional 2D games. It's free on Steam.

These are great but I don't understand why you sized them like this. I'd expect the icons and spacing to be a multiple of 100 to make it easier to work with 

These are amazing, can't wait to get them in my game!

Looks cool, but it didn't seem to tile very well in my game