Tile based collisions (Seven_of_Hearts' "I made a soundtrack and now it's a game" remix) WASD to move the red hit box, arrows to move the view centre, press or hold space bar to centre the camera, q and e to change the size of the hit box, click on tiles to switch between solid and empty. Hold N and G at the same time to reset the map.
Music is a my own work in progress, when it's done it'll be released at photosynthesist.bandcamp.com Now it sounds like this is a shameless promotion... uhh... DON'T GO THERE BUT COS IT SUCKS AND YOU WON'T LIKE IT