I was able to get to the background shift at 10k. But my hand could not spam space ba rlong enough to hit 100k. I had to stop in the 20's. I'd say cut the high score at least in half, maybe down to 25k to be reasonable. Hit boxes were also a little wonky and I found a bug where the corpses could kill you.

Creative use of the theme to have this be a haunted lost game from the past! However, the gameplay gets quite tedious and the high-score is set far too high. Each enemy only gives 100 points and you need 100,000 points, meaning you need to kill 1,000 enemies... Well, in practice, not quite as many since if you spam a few shots really fast, you can hit the enemy's death sprite for additional points (probably a bug). I can usually score about 400 points on each enemy doing this, but it still takes a really long time. The game does a good job at being unsettling with its background effects!