Arrow key controls would be nice (with something like shift used for dashing) as would a download for offline play.
Also not sure how the rating system works, seems kind of random, I've gotten 3 stars when getting caught right at the start, and other times got 1 star after going for 1000's of meters, seems to be based more on her mood(?) but I'm not sure if I'm reading too heavily into her AI in that regard, I'm under the assumption she has some kind of mood mechanic, where she's more aggressive sometimes and more passive/flirty other times (since the game specfically calls out that she's mad, which seems to cause her to chew instead of swallow when catching you.) I've never gotten more than 3 stars, so not sure if I just don't know how to placate her or if I'm just making her aggressive due to my playstyle, it seems like making her run into objects causes her to get angry, although most of the time that's her own fault, she especially loves to run into the rocks/ship parts at the bottom of the screen over and over again.
Also game could use some more obstacles, the description mentions more threats in each zone but the only one I noticed was the addition of ship parts when reaching the ship graveyard, and functionally those are just a reskin of rocks. More sea life Mako can interact with in unique ways would be nice, something like a squid that could ink her if she tries to eat it/gets too close, which could blind her for a few seconds. Also maybe have some semi-lasting effects for her encountering hazards, just stuff like red marks being left by running into objects or mines.
Thanks for your feedback, I really appreciate it! Arrow key controls are already possible and the space key is used for dashing in that case. I will also look to improve your mentioned points and make her AI better, as well as adding more obstacles. The rating works by how long the scene is (so a bit random) and how much the diver struggles (as in when you still try to move while being caught already)