Whatever platform/engine(s) you end up trying, you both might enjoy looking through the game assets that Kenney shares with the world for free: * https://kenney.nl/assets * https://kenney.nl/starter-kits The asset range includes 2D & 3D and in a variety of graphical fidelity/style from 1-bit to low-poly--including sets which are designed to work together. The "Starter Kits" are a more recent development which aim... - Source: Hacker News / 5 months ago

These look fabulous. Another great resource for free 2D game assets: https://kenney.nl/assets. - Source: Hacker News / 6 months ago

Look at kenney.nl/assets, hundreds of sounds and other assets, all free. Source: about 1 year ago

Most of the assets came from Kenney, but there are way too many combined sources to list them all here. If you want to know where anything came from, feel free to ask. Source: about 1 year ago

Not quite an answer to the question, but there's a bunch of free asset libraries out there! Assets · Kenney. Source: about 1 year ago

On the official version, it's pretty easy, throw weapons into the mix and things get interesting. Source: over 2 years ago