Kings of Wings (with bugs to fix)

Listing Details

Its a platformer game (similar to speedrunners). Published on steam, It works perfectly with up to 2 players. 3 or 4 players is considered but it needs implementation. Developed in GAME MAKER STUDIO 2 (That's important, as it is an easy engine to develop and publish to multiple platforms). Available for windows but can work on Mac or Linux (just need to add it on steam, it already works for those platforms). Could work for Xbox One, PS4 and nintendo switch but I don't own the license to publish it there. Gamepad support is already available. Game is at a 95% developed. It includes levels, story mode, local multiplayer (same device), gamepad support, all assets are included (sprites, backgrounds, objects, soundtracks, sound FX) IT HAS HAD LOW REVENUE BECAUSE NO MARKETING HAS BEEN DONE (Existing users and sales were organic through STEAM).

How can the buyer take this project further?

What could improve the game? 

1. Do some marketing to increase sales.
2. Hire a developer (there are many available on Fiverr and Upwork) to develop the 3 and 4 players mode and more features.