Good, but personally i think that not being able to upgrade at range makes it play a little bit like a chore, having to be moving a lot of the time. I played it long enough to max 1/2 of the talent tree- each point spent gives you the feeling that you will be able to push more waves. Maybe consider adding more game changing/ QOL upgrades, such as auto build or build range and utilize lpm- in my opinion this could improve the experience.