Good morning naizugal. Whatever integrated graphics you have will determine what OpenGL driver you can upgrade to - probably 3.0, maybe 4.0 or so. You might be over capacity now. Once appropriately done, it should be able to handle Dota 2 in low resolution and detail. Gaming laptops start at $1,000+ and usually have 2GB dedicated memory. Playing below tech level is of course done, and workarounds should be on gaming forums. I am not a gamer, so I can offer only limited advice.

League of Legends worked better with Olayon Liunux than Dota  

I solved the issue by installing mesa-utils.

Good idea to take a comprehensive approach. Good to know it works in deepin for this purpose. Thanks for the update, and enjoy the game!