@cwebber Whenever I feel I would feel guilty after relaxing, I go and relax, and tell future me to just deal with it, and remember the last time I "forgot" to relax and pushed myself further and further. Nothing good came out of it, and I regretted not taking time off. Having a break refreshes the mind, and coming back later one can finish what they started with a lot more enthusiasm. Possibly with new ideas, too.
Go and play a roguelike. They are awesome.