Well, I lost all my lifes on level 4. I really liked it and different mechanics of shooting and digging combined really well and you could do interesting things with them. Honestly I'd add restart button because I think it's easy for a level to become unbeatable because of lack of resources.
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Thank you so much, i did not think that it will be challenging, but you could hire ally to fight with you, or buy weapons or shield to protect you from he shop, but you still absolutely correct, it would be better to make it with health only not lives and user enter any level with full health and if he lose it the level restart again with full health, i may expand the game and do this, by the way i really enjoyed your game and the journey