1- I was torn between perspective and isometric view when developing the game and the perspective was better for some cases but I'm thinking of adding a perspective-isometric option into the game.
2- I'm using Kenney's golf pack and as you've said there are lots of collider errors in the pack which you can see from the graphics, sometimes there are small gaps between the tiles. I'm not able to fix it unless going through each of them and manually tweaking it which is tedious
but in the next update, I will definitely look into it while trying to add more levels
Thanks for your feedback! :)