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And also the mouse issue seems to happen only to you ? Im not sure if you have a different/special kind of mouse ? more than 3 different people with different PCs/Laptops tested it and it worked everytime, soo I'm not really sure how to fix this problem. Sorry ! 

When you click on a object with left click, a text should appear, then you're able to use 1-5 but only for certain objects. You have to be really fast, cus after a few secs you won't "remember" the spell anymore. So try clicking left mouse button and then 1-5 and also not all objects work with the same "spell". Hope this helps <3