If you absolutely want mods, try "Shadow Fight 2 Special Edition" (the premium paid version with no energy bar and no microtransactions). It is available on the App Store for $2.99. You get 90% of the "max level" freedom without the malware risk of the 1938 APK.

You have an old, disconnected tablet you don't care about, and you just want to see what the "Twilight" zone looks like with maxed-out gear for 20 minutes.

Upgrading your gear to match your level is incredibly expensive. This mod gives you unlimited Gold and Underworld Gems. You can purchase any weapon in the shop and upgrade its stats to the maximum level without worrying about currency. Unlocked Boss Weapons and Titan's Gear