Solo dev here looking for feedback on my new game - The black Hour

Trailer (short): https://youtube.com/shorts/JfzdQ_Xo5qY
Play it (free, no account needed - in the browser): https://the-black-hour-front.onrender.com/home

You’re the last human in a ruined city. Each day you dig for resources, build defenses and learn skills. Each night a horde attacks, and it gets bigger every night. If your defense is lower than the horde, your city falls.

When your city falls you earn coins for new building plans and permanent bonuses. You build a deck of 20 plans, upgrade them, and trade the duplicates on a player-run Black Market.

Hi! Played it, I love the concept!

What I liked:

- The idea itself is really cool and stands out

- The time pressure works well psychologically: with the clock ticking, you feel the urge to play fast and to learn good builds, which keeps you engaged

What confused me:

- When I start a new run, I get gold, but I didn't understand how or where to use it. A short hint at the start of a new run (or a clear button/menu to spend it) would help a lot.

- Once I had bought everything in the "learn" menu, it felt like it had no use anymore. Maybe it could unlock new tiers, or offer something to spend on later in the game, so it stays useful.

What I'd like to see:

- More content. After a while, the loop felt a bit short: search for supplies, then build defenses, and that's it. More variety (events, different zombie types maybe, places to explore, objectives during the night) would make each run feel different and keep me playing longer.

Great work, good luck with it!

City falls, then coins for the next deck, is a clean fail. Tip before more night events: on the night you drop, hold the shortfall on screen for a beat, your defense versus that horde, before the coin shop opens. The number you missed is what makes the next plan pick feel earned.