I don't think it would affect the minimum specs all that much, the screen is already cluttered, and if you engage with any larianisms eventually you will find the entire battlefield with 20+ creatures all on fire while the battlefiled itself is on fire while something else is happening. Another two combatants under your control actually helps tilts things back into a more balanced state where players have more turns and thus a miss on one character is not as critical.
Also not really unbalanced with the sleep thing, in fact that is actually working as intended. Sleep is a common low level spell, it is a saving throw that your party can pass, and Elves and certain other character types have advantage on certain saving throws and immunity to sleep. In a casting system where slots are limited, something like sleep is reasonable. Especially since it is likely to be resisted, the elf can be punished to remove concentration, and if anything happens to your party will awaken them, not to mention the fact that it affects a certain health amount so at a higher level of level 3, you will definitely have party members who are not affected because she can not upcast it.
5e magic is strong but balanced, with how larian changed magic it is kinda a mess right now, but the elf being immune to sleep is not the problem. If we were given 5e magic as it were I think it would be much better received, especially with how on its own the magic system encourages party members to work together and combo things for extra effectiveness.
