I really enjoyed this! I like both the attack and defense QTE-type mechanics. I was a bit frustrated initially before finding the weapons folder, then it was a bit smoother. I lost my first run, but after seeing how useful defense is, won much easier the second time around.
I love the theming - both the computer file aesthetic and the choice between health/offense/defense. It does seem like giving up health for defense is a bit strong, since I was getting hit for 14-15 by the boss the first time, and just 1 or 2 the second. But was fun to have the option to trade-off.