Good f2p game, by a solid developer
I would also recommend checking out OneBit adventure(also by this dev)

A fast-paced arcade game where players swipe a cube to match its color to the displayed target. Earn points by reacting quickly and strategically use powerups to boost your score. Unlock new cubes and upgrade abilities to reach higher levels.
0.11
August 11, 2021
- Fixed powers ups not being able to max upgrade - Fixed thumbnail to be symmetrical
Spectrum Cube is a casual arcade reflex game where you swipe a cube to match the correct color displayed. The faster you are, the more points you get.
Each game session in Spectrum Cube is a quick and easy 40 seconds of gameplay.
Yes, Spectrum Cube offers offline game functionality, allowing you to play without an internet connection.
Spectrum Cube features 5 different powerups that can help increase your score, multiplier, or even freeze time.
You can level up in Spectrum Cube up to level 100. Powerups can also be leveled up for enhanced effects.
Spectrum Cube is available on iPhone, iPad, and iPod devices.
Yes, Spectrum Cube is a free game. It does not contain advertisements or in-app purchases.
Spectrum Cube was last updated on August 11, 2021, with version 0.11. The initial release was on August 4, 2021.