Thanks for the nice feedback! I do indeed got inspired from PvZ even though I never played it :)
actually there isn't an option to toggle hp bars right now, but it is planned for a future update. Also we do plan to add a queue system to the lane, do you think it will fit or not?
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That sounds like a good idea! I would suggest having a common queue of upcoming units, with their lane being assigned at random upon spawn (i.e. the player knows what unit will come next, but not on which lane). This would allow the player to strategise a bit but still keep the tension. PvZ does something similar: at the beginning of each level, they show you all the enemies you will face, but don't tell you when or from which lane they will come. In any case, the best would be to playtest it and see what approach is more fun!
Good luck and hope to see the future version! :)