Short term:
- Complete all 3 elements, so that every element has 3 towers of each rarity
- Increase performance and stability
- Add skill so that there are enough points for player level 99
- Overhaul of card decks/inventory
-> Make the current thing round and stable
Mid term:
- Add builders
- Add champion creeps
- Difficulty setting (maybe something like normal/nightmare/hell -> This would be something for new map layouts, too)
- Add foil cards with mini achievements
- Extend ladder to reflect foil cards/game stats/tower stats
-> Make it somewhat feature complete
Long term:
- Animated towers
- Aura effects
-> Make it look nicer
Long, long, long term (2.0)
- I'd love to see some multiplayer/coop/pvp content. But it needs some good thinking to make it work conceptionally on mobile...