Well...
1. Jumps: You missed a lot of stars, because of the annoying jumps. They are not hard by themselves (sometimes), but with a ton of enemies, exploding right at your cart: Unnecessary hard.
2. Ads: Is it really necessary to shift random clicks on the play-button to another site? I can't remember them, because I closed them as soon as they opened. And I bet: I'm not alone with this. So you won't get new users to those sites. You want users? Be honest and place a button somewhere like other developers did. Don't know, if the publisher forced you for this or it was your idea. If it was the publisher: Leave them and get a better one. You can do good games and don't let them get ruined by them.
3. Accuracy: Did you play your game at least once to get all stars? No? I bet you didn't. Because then you would have known, that accuracy is only possibly with the crossbow. With no other weapon is it doable. And sometimes not even with this weapon.
4. Cursor: It's really a pain to follow the cursor to aim. Sometimes I need several seconds to get my cursor there, where I will aim to. Maybe too tiny or wrong color? Can't say. I only can say, it's hard to see.
5. Coins & First Aid: Both are hard to pickup. You deal with tons of enemies & a system of stars, where accuracy, health and the amount of goods is counted. It's hard enough to deal with the saws and the enemies alone. Even tougher to deal with fulfilling the 75% for the stars.
How about to get the coins automatically or like other games like this will do: Magnet upgrades? Magnet must not magnetize some needed things, like goods - but 1st aid and coins.
6. Goods: No user will have the need to grind for them. Why? You'll get tons of the goods. Either you remove them or hardcode the amount of goods per level. So players will need to get all or some of the goods to get the next level unlocked.
7. FOV: Yes, the field of view is a bit distorted. You'll see the cut amount of money in the upgrade screen very well. Mistake? Bug? Maybe you can also enlarge the it to get the enemies better seen. Sometimes, they're arriving very fast and you have to deal with the points, I mentioned before.
Summary: Pretty nice game, but something has to get fixed to make it superior.