Hi there, thanks for trying my games! Glad you are enjoying my continuing look/theme. It was a conscious choice, but also a way to save time on making assets each week, haha. Another coming soon :)
I'm using Construct 2 to build my games. For art assets, I'm using piskelapp.com and Photoshop CS6. Piskelapp is very basic, but I find it great for quickly making animated sprites. Lastly, when I have time to add SFX, I've been using https://www.bfxr.net/ to quickly generate retro sounds.