[blackpill0w]

>You just can't play chess like that

You most definitely can, it'd just take more time since you have to rediscover a lot of things that could be given to you as advice.

>I play against computer

Don't play against the computer if you're a beginner and want to improve, bots play in an exotic way and that won't help you.

>I have 0 time I can invest into learning the moves

I don't spend time learning opening theory either (I am just 1800 on Lichess), I just play and use the engine to see where I screwed up and what was the better move (I advise you to use Lichess (https://lichess.org/) over chess.com because open source + don't have to pay for engine analysis and puzzles). Talking about puzzles, play a lot of them, they'll train you to spot tactics. Finally, don't forget to have fun :)