Leaving off ending parentheses makes no difference in the size of the compiled program (the one that users will actually play), and it can create many bugs if the programmer isn't entirely sure of what he's doing.

For example, look at this code:

Quote from: Axe

{L1+5→A

You probably think it's doing the same thing as this:

Quote from: Axe

{L1+5}→A

But what it's really doing is this:

Quote from: Axe

{L1+5→A}

That's the sort of thing you'll have to deal with if you get in the habit of leaving off parentheses in Axe. So just leave them on—one keystroke will save you a ton of trouble later

EDIT: project ideas do not have to be games it can be anything that can be programmed on comp(not websites/on-calc stuff).