Yes, version 0.3.0 is quite raw, this is purely to familiarize you with the initial mechanics of the game. We apologize for any inconvenience.
In version 0.3.0 there is indeed no revival after death, we added this feature in version 0.4.0 (on Patreon/Telegram).
In version 0.3.0, level control engages the mouse for melee attacks. In version 0.4.0, the controls have changed: