Pretty neat! i think this is something hard to balance for sure, which is the use of time as a currency! There is this added pressure to make good decisions while keeping an eye on the clock!
maybe it would be good to have things like health and time be more connected so it keeps it far simpler? Because choosing to heal in the sake of losing time feels like a very hard call to make, because you'll lose if you run out of time or health, so perhaps if your health is simply just the time too, you can just use 'time/heal' cards with very little complication, but they are more rare to come by? or are single use and are removed from your deck so that is the cost of using them. Either way, great job on this, very ambitious... i should know hahah did something too ambitious as well lol.
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Thanks for the review! Another comment suggested to remove the health bar too, it is an interesting idea worth experimenting with, but personally I think having them both is better as it gives more variance in enemies and cards, but it introduces the issue of balance, but i think with enough play testing and some math, there's probably a way to keep the game play and cards usage smooth and easy for the player