Shoutout to whoever made this challenge for making an awesome game.
When it comes to cheating in games, the first thing that comes to mind is cheat engine of course.
Launching the game and playing through it for a while, it becomes obvious it is not so easily to find the values corresponding to the Health and Deaths gauge.
Continuing through the game, reaching the final level, it becomes clear the boss is undefeatable. Within cheat engine, if we assume the damage down by our handy marker pens is one each time, we can scan for an unknown initlal value and then scan for a decreased value by one each time.
From this, we find the value storing the bosses health, which we can just set to zero. With the boss dead we win. A win screen rolls with the flag.