That's great to hear your enjoying your new phone @ItzZia 👍
When playing games especially if it's a resource hungry one or playing for extended periods of time then this will draw on more resources in the phone and create heat as it works harder although the cooling system inside the phone will help dissipate heat build up to a point it's also advisable to remove any case to stop it from hindering the heat dissipation.
Using more resources will come hand in hand with more battery drain.
If your going to be a regular gamer then perhaps carry a lightweight portable power bank !
The Qualcomm Snapdragon SoC in my personal experience has been good at optimisation providing more battery time than the Exynos SoC phone's I've owned.
A new phone will take around 2 weeks to fully optimise while it's in the learning phase.
And the battery itself won't hit peak optimum output until its been charged and discharged a few times.
Try also going into your phone's Battery and Device Care and hit the optimisation button.
Also in that section tap on battery after a full days usage and it'll present you with a list of apps that has been using the battery so you can then decide to either leave them be or perhaps put some in sleep or deep sleep mode.
Using dark mode helps too.
There are some more battery saving tips if you perform a forum search.
I wish you all the best. 
