This is a really neat idea! Juggling the card timers, your health, and your inventory is a fun challenge. I especially like the judgement call of choosing a worse portal with what you have rather than wait for a better portal. To that end, it might be nice to see a little farther ahead on the map, so you could know more of what you're getting into when you choose to go for or wait on a portal. Great job, it's fun!