Wow, your game is really creative! Especially the boosts you get from those yellow blockages :D And the heartbeat that changes the direction! I don't know how you guys thought of this, but you nailed it for the game theme! Reminds me of all the cartoons when somebody had to shrink and go in somebody else's body to fight some sort of deadly bacteria or [insert medical term here], so the game hit me nostalgically :D. One thing that was kinda confusing for me is that if you do along the borders of the vein it looks like you are hurting it. I didn't see if that slows the player down. If not - it could be a cool feature - to be able to "dig" out of the vein and using the mini map to find your way back :) I played for some time, but didn't complete all the maps, so, sorry if I am saying things that are already in the game.
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Hey thanks for the comment! Great to hear you enjoyed it :) The medical condition that you are clearing the blockages from is actually a plaster along the wall of the artery in real-life. So our original goal was for the player to grind it away from the edges and get a speedup from that. Later on we changed that during our playtests, but we kept the grinding since it was just really fun to grind along :) So currently you get increased max-speed and increased impulse from the heartbeat the longer you grind.
We should probably make this all way more clear in a next version. We had a lot of feedback that it wasn't really clear if grinding was good or bad since it looks like damaging.