TimeSense: Reaction Time Test - Train your brain to feel time without a clock

Hey Product Hunt! 👋 I'm Marijan, an indie dev from the Balkans, and TimeSense is my first published game on Google Play. The idea came from a simple question: how well do we actually feel time without looking at a clock? Turns out — not very well, and it's weirdly addictive to try and improve. I built it solo in Kotlin with Firebase for the online features. The Online Duel mode was the trickiest part — getting two players to compete on time perception in real-time required some creative solutions around Firebase's real-time sync. A few things I'd love feedback on: - Which game mode feels most fun to you? - Is the difficulty curve right or too steep? - Any features you'd want to see next? The game is free with optional ads. No paywalls, no premium currency — I wanted it to be genuinely playable for everyone. Happy to answer any questions about the development, Firebase architecture, or launching as a solo dev. Thanks for checking it out! 🙏