I like that you stick to one restricted colour palette in your design. It reminds me of the good old times when I played Zelda: Links Awakening on the SNES with the Gameboy Adapter and you could change around the basic colour palette. The idea with the heartbeat is great - and challenging! The flashing can be hard on the eyes.... maybe instead of changing between complete darkness and light, how about using a circle shaped Sprite Mask that functions as light and that expands to almost full screen size with the heartbeat and after each single heartbeat shrinks back to a tiny circle around the player. I this way the eyes had some fixed point in the centre they can focus on and it may make the flashing more comfortable for the eyes. But thats just a rough idea. And of course: Great nostalgic game music :)
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Hey Pidibidi! Great suggestion with the Sprite Mask, I wanted to achieve something like you described but I didn't know how to make it and because of limited timeline I've sticked to flashing. Now I'll know that Sprite Mask is something to experiment in future games. Really cool that you appreciate the colour palette. I'm more programmer than artist but I really wanted to achieve that oldschool vibe in the game. Although making everything readable for the player in just few colors that was a big challenge to me! Thanks for the feedback it's really nice to read such comments.