itch.io

I tried out the changes myself and it works for me, with the one small change I mentioned:

var anilen = global.skelani_animation_length[atkanimation] - 1;

(It's a bit tricky to see since the animation is only 5 frames long, but you can press "Home" to lower the framerate to 10/s)

So the full, working script looks like this:

/// @description psm_melee()
function psm_melee() {
    var anilen = global.skelani_animation_length[atkanimation] - 1;
    //Physics
    if(onground){
        player_naturalfriction()
    }
    player_controls_jump() //Can jump-cancel
    player_inertia_x()
    player_inertia_y()
    player_boundaryclamp()
    //Animate, spawn attack
    statecntr++
    if(statecntr < atkwarmup){
        skelani_set_animation(atkanimation,0)
    }
    else if(statecntr < atkwarmup + atkduration){
        skelani_set_animation(atkanimation,anilen*(statecntr-atkwarmup)/atkduration)
    }
    else if(statecntr == atkwarmup + atkduration){
        skelani_set_animation(atkanimation,anilen)
        n = instance_create(x,y,atkhitboxobj)
        n.image_xscale = skelani_xscale
        n.sprite_index = atkhitboxspr
        with(n){
            player_weapon_get_stat_block_current()
        
            //Heavy attacks are 30% stronger, but only for melee weaposn, so this code is only here.
            if(other.atk_isheavy){
                rpg_adjust_atk_stat_block_uniformly(1.3,0)
            }
        
            //When winded, lower power of attack
            if(other.atk_winded){
                rpg_adjust_atk_stat_block_uniformly(0.7,0)
            }
        
            //When wielding a weapon without proper stats, power is reduced greatly.
            var str, dex, int, fth;
            str = db_read_stat(itemtype_WEAPON,other.atk_weapon,wd_REQUIREMENT_STR)
            dex = db_read_stat(itemtype_WEAPON,other.atk_weapon,wd_REQUIREMENT_DEX)
            int = db_read_stat(itemtype_WEAPON,other.atk_weapon,wd_REQUIREMENT_INT)
            fth = db_read_stat(itemtype_WEAPON,other.atk_weapon,wd_REQUIREMENT_FTH)
            if(!player_meets_requirements(str,dex,int,fth)){
                rpg_adjust_atk_stat_block_uniformly(0.1,0)
            }
        }
        n.lifetime      = atkduration
        n.blockbreaker  = player_weapon_get_stat(wd_BLOCKBREAKER)
    }
    else if(statecntr < atkwarmup + atkduration + atkcooldown){
        skelani_set_animation(atkanimation,anilen)
    }
    else{
        state = psm_ordinary
    }
    //Handle animation with correct hand
    player_animate_offhandswap()
    //Kneel down when crouching
    if(crouching){
        skelani_override_crouch()
    }
}