Very difficult, but I like a challenge! The checkpoints did help though - and I do like how generous they were with how close you had to be to activate them, since a few times I died just before one but still managed to respawn there. The graphics are awesome, I really like the heartbeat monitor look, and the postprocessing helps makes it even better. The BPM counter in the top right was nice as well, though it did reset even if you were at a checkpoint, so it mostly stayed around 0-10 for me :P. A great game regardless, I had fun! Well done!